Sharp Aquos 80" Backlight Issues

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  • tom050
    New Member
    • Nov 2016
    • 3
    • Canada

    #1

    Sharp Aquos 80" Backlight Issues

    Hi there,

    Just looking for a little assistance with the backlight. There is some issues with the back light on my tv so I took it all apart to get to the backlight strips. I have viewed some videos how to test the individual leds with two double aa batteries in series. Just to clarify the led strip is 30 leds long and each one is 3.1 volts as marked on the strip. It also says 94 volts per strip which makes sense with the 30 leds. Now when I try to test one led on the strip and I have confirmed the positive and negative but the led does not light up.

    Is it possible that all the LEDs on all the strips were fried during some surge or issue with the power supply? Or am I missing something here?

    Thanks

    Tom
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Sharp Aquos 80" Backlight Issues

    "It also says 94 volts per strip " The 94V i s NOT the Voltage rating, that has to do with UL compliance rating of the PCB.
    UL94 V-0, V-1, V-2 FLAMMABILITY STANDARD
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Sharp Aquos 80" Backlight Issues

      How about some good clear pictures of what we are dealing with?
      Also not good idea to test LED without having current limiter in place.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • tom050
        New Member
        • Nov 2016
        • 3
        • Canada

        #4
        Re: Sharp Aquos 80" Backlight Issues

        Hi there,

        There is many video showing testing the led and the leds should be approx 3.1volts according to my research. Please see picture of backlights. Hope someone can help.

        Tom
        Attached Files

        Comment

        • kimarcher_gy
          Member
          • Sep 2016
          • 34
          • Guyana

          #5
          Re: Sharp Aquos 80" Backlight Issues

          I am presently troubleshooting a LC-80LE632U TV, if you check my posts you will find some information on the LED's they are 30 in series for each of the fifteen rows and 3 vdc per LED times 30 is a total of 90 vdc which is a safe voltage to test them but if you need something more specific please get the Part Number of the LED and check the Data Sheet. Please remember that the negative probe should go to the Cathode and the Positive to the Anode when checking each individual LED with 3VDC.
          Last edited by kimarcher_gy; 01-06-2017, 05:24 AM. Reason: Left out some information.

          Comment

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